Spring-toothed harrow.



sans' SPRING-TOOTHED HARROW.

i To all whom t may concern:

. Be it known that I, JOSEPH J. KOVAR, a citizen of the United States, Dodge Center', Claremont township, in the county'of Dodge and State of Minnesota, have invented certain new and useful Improvements in Spring-Toothed Harrows; and 1 do hereby declare the following to be a full, clear, and exact descriptionof the invention, -vsuch as will enable others skilled in the art to which it appertains to maker and use the same.

My invention has for its object to provide an improved spring toothed harrow.

To such ends, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and vdefined in the claims.

In the accompanyingl drawings which illustrate the invention, like characters indieate like parts throughout the several views.

Referring to the'drawings' .Figure 1 1s av plan view showing the improved harrow,

some parts being sectioned; Fig. 2 shows the hai-row chiefly in side elevation but with some parts sectioned on the line :r2 m2 on Fig. 1; and Fig. Sis a detail 1n rear clevation and with some parts broken away, showinga portionof the barrow.

The improved harrow is adapted [to be made in any desired number'of sections or units, but in the drawings, 1t 1s shown as made up of two sections or umts connected to a common equalizing beam 1 having connections 2, to which-a two, three or four horse evener may be attached. Each section or unit of this improved harrow comprises a pair of laterally spaced forwardly and rearwardly extended drag bars 3, the front ends of which are flexibly connected to the equalizer beamy 1. shown, are accomplished by clevises 4 and 5 and a connecting link 6. The clevises 4 are shown as pivotally connected to the beam 1, and the clevises are pivotally connected to the forwardly projecting ends of coupling brackets 7, These coupling/brackets 7 are riveted, or otherwise secured, to the front ends of the'dragbars, and rovided with inwardly diverging sockets 8. Tie bars 9 connect the front ends of the drag bars 3, their ends vbeing inserted i and ivotally connected to the sockets 8v ith loose joints, which permit the dragbars to assume different angular` positions 1n hori- Specication of Letters Patent.

residing at ters 14 may be passedthrough ing ends of the keys 12 to prevent their* accidental displacement.

These connections, asA

Patented Feb. 8, I191.6..

Application led January 23,' 1914. Serial No. 813,872.

zontal plane in respect to the equalizing beams4 1.

The drag bars 3 are preferably made from angle steel or iron set with their lower flanges horizontally ment with the ground upturned. Riveted or cured to the upturned otherwise rigidly seflanges of the drag bars 3 are rock shaft bearings 10the upper ends of which are formed with sockets 101 (see particularly Fig. 3), that are arranged to receive-and looselyfit the ends of tubular rock shafts or pipes 11. Said rock shafts 11 are adapted for horizontal angular movements within the sockets 10a,`s that their drag bars 3 may change their* angle slightly in' respect to the several rock shafts, and they are, as shown, thus loosely connected by keys l2 inserted through slots in theA .ends of the said tubular shafts, and through slots in the inwardlyA projecting ends .of headed trunnions 13, the heads of which bear against the outer faces of the upper ends of the said brackets 10. If desired, split keys or cotthe depend- The several rock shafts '11 are provided with upwardly extended arms 15 that are connected by a link 16 pivoted to the upper ends-thereof, so that the said rock shafts will be given 'common v'oscillatory lmoveward extension in theJ form of an operating lever 17 provided with a latch 18 that cooperateswith a notched latch 4segment 19, which latter is secured on the rear. end por,- tion of the link 16. adapted to be'lockedto vthe segment 19 in different adjustments, so as to hold the rock shafts llin different positions.

The spring harrow teeth 2O are of curved 4and approximatel involute form, formed from flat spring steel having sharp diamond pointed free ends for engagement with the ground and having theirother ends bolted,

disposed for engage-v and their other flanges The latch lever` 17 is ments The real-most arm 15 has a long ulpor otherwise rigidly secured to the respective rock lshafts 1l-. The spring teeth 20 of the several rock shafts are staggered in respect to each other, so that they will loosen up the entire surface of the ground over which the harrow is passed. 1

One feature in the present application is found in the form and arrangement .of the spring harrow teeth, whereby they are adapted to be set with their fiat diamond points directly below the rock shaft to which lthey are attached, and with the said points different positions by proper manipulation of the lever 17.

The adjacent drag bars of the several sections or units of the harrow are arranged to Work very closely together, so thatthe aol- 1 jacent harrow teeth sections Will come close together and not leaves an unvvorkcdv or harrowed ridge ground between the harrow sections.

ln the use of the hai-row, under certain conditions, and especially When the barrow is turning a curve or is drawn on a curved line, the drag bars ofthe harrow sections, being flexibly tied together, may move in respect to each other and in respect to the rock shafts 1l and tie bar 9, and equalizing beam l, so that they will more closely follow in the direct line of draft. Otherwise stated, when the harrow is drawn straight ahead and equal draft strainis applied on both harrow sections, the rear parallel portions of the rag bars 3 Will be at a right angle to the con-l necting rock shafts 1l, but when traveling a curve, the said drag bars will change their angle in respect to said rock shafts. The rock shafts 'it will be noted, also serve as ties between the drag bars.

As already indicated7 the elliciency of this Livenet improved harrow hasbe'en demonstrated in practice,

What l claim 1s:

l. l'n a harroiv, the combination with a.A

front cross bar exibly connected, at its ends,

to the, front ends of saiddrag bars.

2. ln a barrow, the combination with a common equalizing beam, of a harrow made up of several units, each unit comprising laterally spaced drag bars iexihly connected,

at their front ends, to said. equalizing beam, v

rock shafts, flexible joints, loosely connecting said rock shafts7 at their ends, tosaid drag bars for movement in a horizontal plane, harroW teeth applied to said rock shafts, means for oscillating the respective rock shafts to adjust the harrow .teeth of each unit, and a front cross har flexibly connected, at its ends, to the front end.; of the respective drag bars. i

3. A. harrow comprising a pair of laterally spaced drag-bars having upwardly bent forwardly converging` front ends, transverse rock-shafts, flexible joints, loosely connecting the rock-shafts at their ends to the dragbars for movement in a horizontal plane, barrow-teeth applied to the rock-shafts, and a. cross-bar connecting the forward ends of the drag-bars and limiting their lateral' swinging movement. A

In testlmony whereof I allix my signature in presence of two Witnesses.

4 JOSEPH J. KCl/'Alt Witnesses:

JOHN KovAR,

F. D. MERCHANT. 

